diff --git a/index.html b/index.html
index 4a0b864..342bd1b 100644
--- a/index.html
+++ b/index.html
@@ -198,15 +198,18 @@
     text-decoration: underline #770000 0.2em;
     background-color: #ffbbbb;
   }
-  .explanation-icon.verified { color: #007700; }
-  .explanation-icon.ok       { color: #002266; }
-  .explanation-icon.valid    { color: #777700; }
-  .explanation-icon.invalid  { color: #770000; }
+  .explanation-box-wrapper {
+    align-self: start;
+    justify-self: center;
+    display: flex;
+    flex-flow: column;
+    align-items: center;
+    justify-items: center;
+    gap: 0.5em;
+  }
   .explanation-box {
     padding: 1em;
     border-radius: 0.5em;
-    align-self: start;
-    justify-self: center;
     width: 20em;
     display: grid;
     column-gap: 0.5em;
@@ -215,6 +218,10 @@
     grid-template-areas: "icon headline"
                          "icon explanation"
   }
+  .explanation-icon.verified { color: #007700; }
+  .explanation-icon.ok       { color: #002266; }
+  .explanation-icon.valid    { color: #777700; }
+  .explanation-icon.invalid  { color: #770000; }
   .explanation-box.verified  { background-color: #bbffbb; }
   .explanation-box.ok        { background-color: #aaddff; }
   .explanation-box.valid     { background-color: #ffffbb; }
diff --git a/src/main.rs b/src/main.rs
index fd49266..db063bf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -140,8 +140,10 @@ fn MainContent() -> impl IntoView {
         }
     });
 
-    let get_explanation_box_class =
+    let get_type_explanation_box_class =
         move || format!("explanation-box {result}", result = eval_type_result());
+    let get_namespace_explanation_box_class =
+        move || format!("explanation-box {result}", result = eval_namespace_result());
 
     view! {
         <div id="input-form">
@@ -223,16 +225,29 @@ fn MainContent() -> impl IntoView {
             subpath={subpath}
         />
 
-        <div class={get_explanation_box_class}>
-            {move || match eval_type_result().as_str() {
-                "verified" => view!{<phosphor_leptos::Checks class="explanation-icon verified" weight=phosphor_leptos::IconWeight::Bold />},
-                "ok" => view!{<phosphor_leptos::Check class="explanation-icon ok" weight=phosphor_leptos::IconWeight::Bold />}       ,
-                "valid" => view!{<phosphor_leptos::Question class="explanation-icon valid" weight=phosphor_leptos::IconWeight::Bold />} ,
-                "invalid" => view!{<phosphor_leptos::Warning class="explanation-icon invalid" weight=phosphor_leptos::IconWeight::Bold />},
-                _ => view!{<phosphor_leptos::Warning class="explanation-icon error" weight=phosphor_leptos::IconWeight::Duotone />},
-            }}
-            <span class="headline">{eval_type_result}</span>
-            <span class="explanation">{eval_type_result_explanation}</span>
+        <div class="explanation-box-wrapper">
+            <div class={get_type_explanation_box_class}>
+                {move || match eval_type_result().as_str() {
+                    "verified" => view!{<phosphor_leptos::Checks class="explanation-icon verified" weight=phosphor_leptos::IconWeight::Bold />},
+                    "ok" => view!{<phosphor_leptos::Check class="explanation-icon ok" weight=phosphor_leptos::IconWeight::Bold />}       ,
+                    "valid" => view!{<phosphor_leptos::Question class="explanation-icon valid" weight=phosphor_leptos::IconWeight::Bold />} ,
+                    "invalid" => view!{<phosphor_leptos::Warning class="explanation-icon invalid" weight=phosphor_leptos::IconWeight::Bold />},
+                    _ => view!{<phosphor_leptos::Warning class="explanation-icon error" weight=phosphor_leptos::IconWeight::Duotone />},
+                }}
+                <span class="headline">{eval_type_result}</span>
+                <span class="explanation">{eval_type_result_explanation}</span>
+            </div>
+            <div class={get_namespace_explanation_box_class}>
+                {move || match eval_namespace_result().as_str() {
+                    "verified" => view!{<phosphor_leptos::Checks class="explanation-icon verified" weight=phosphor_leptos::IconWeight::Bold />},
+                    "ok" => view!{<phosphor_leptos::Check class="explanation-icon ok" weight=phosphor_leptos::IconWeight::Bold />}       ,
+                    "valid" => view!{<phosphor_leptos::Question class="explanation-icon valid" weight=phosphor_leptos::IconWeight::Bold />} ,
+                    "invalid" => view!{<phosphor_leptos::Warning class="explanation-icon invalid" weight=phosphor_leptos::IconWeight::Bold />},
+                    _ => view!{<phosphor_leptos::Warning class="explanation-icon error" weight=phosphor_leptos::IconWeight::Duotone />},
+                }}
+                <span class="headline">{eval_namespace_result}</span>
+                <span class="explanation">{eval_namespace_result_explanation}</span>
+            </div>
         </div>
     }
 }
diff --git a/src/purl_data.rs b/src/purl_data.rs
index 0e0747e..3c532ad 100644
--- a/src/purl_data.rs
+++ b/src/purl_data.rs
@@ -440,6 +440,9 @@ pub trait PurlComponent {
 
 impl PurlComponent for PurlNamespace {
     fn new_naive(s: &str) -> Self {
+        if s.is_empty() {
+            return vec![];
+        }
         s.split('/').map(|s| s.to_string()).collect()
     }
 
diff --git a/src/purl_eval.rs b/src/purl_eval.rs
index a41f0fd..dccaae7 100644
--- a/src/purl_eval.rs
+++ b/src/purl_eval.rs
@@ -1,4 +1,4 @@
-use crate::purl_data::{PurlType, PurlTypeStatus};
+use crate::purl_data::{self, PurlComponent, PurlType, PurlTypeStatus};
 
 lazy_static! {
     pub static ref TYPE_REGEX: regex::Regex =
@@ -51,6 +51,14 @@ pub fn eval_purl_type(purl_type: PurlType) -> EvalResult {
     }
 }
 
-pub fn eval_purl_namespace(purl_namespace: Vec<String>) -> EvalResult {
-    EvalResult::Verified("fake".to_string())
+pub fn eval_purl_namespace(purl_namespace: purl_data::PurlNamespace) -> EvalResult {
+    // TODO: regex check
+
+    if purl_namespace.len() != purl_namespace.as_canonical().len() {
+        return EvalResult::AtLeastValid(
+            "had to remove leading or trailing empty segments from namespace".to_string(),
+        );
+    }
+
+    EvalResult::ProbablyOk("I see no issue...".to_string())
 }