diff --git a/src/header/common/if_match.rs b/src/header/common/if_match.rs
index 9d74dbe3..1210b44c 100644
--- a/src/header/common/if_match.rs
+++ b/src/header/common/if_match.rs
@@ -20,6 +20,10 @@ header! {
     #[doc="```plain"]
     #[doc="If-Match = \"*\" / 1#entity-tag"]
     #[doc="```"]
+    #[doc=""]
+    #[doc="# Example values"]
+    #[doc="* `\"xyzzy\"`"]
+    #[doc="* \"xyzzy\", \"r2d2xxxx\", \"c3piozzzz\""]
     (IfMatch, "If-Match") => {Any / (EntityTag)+}
 
     test_if_match {
diff --git a/src/header/common/if_modified_since.rs b/src/header/common/if_modified_since.rs
index 67241b84..59e0c6f2 100644
--- a/src/header/common/if_modified_since.rs
+++ b/src/header/common/if_modified_since.rs
@@ -14,6 +14,9 @@ header! {
     #[doc="```plain"]
     #[doc="If-Unmodified-Since = HTTP-date"]
     #[doc="```"]
+    #[doc=""]
+    #[doc="# Example values"]
+    #[doc="* `Sat, 29 Oct 1994 19:43:31 GMT`"]
     (IfModifiedSince, "If-Modified-Since") => [HttpDate]
 
     test_if_modified_since {
diff --git a/src/header/common/if_none_match.rs b/src/header/common/if_none_match.rs
index 697cd7d2..09035011 100644
--- a/src/header/common/if_none_match.rs
+++ b/src/header/common/if_none_match.rs
@@ -19,6 +19,13 @@ header! {
     #[doc="```plain"]
     #[doc="If-None-Match = \"*\" / 1#entity-tag"]
     #[doc="```"]
+    #[doc=""]
+    #[doc="# Example values"]
+    #[doc="* `\"xyzzy\"`"]
+    #[doc="* `W/\"xyzzy\"`"]
+    #[doc="* `\"xyzzy\", \"r2d2xxxx\", \"c3piozzzz\"`"]
+    #[doc="* `W/\"xyzzy\", W/\"r2d2xxxx\", W/\"c3piozzzz\"`"]
+    #[doc="* `*`"]
     (IfNoneMatch, "If-None-Match") => {Any / (EntityTag)+}
 
     test_if_none_match {
diff --git a/src/header/common/if_unmodified_since.rs b/src/header/common/if_unmodified_since.rs
index 9fd3afbd..7ec2e20c 100644
--- a/src/header/common/if_unmodified_since.rs
+++ b/src/header/common/if_unmodified_since.rs
@@ -14,6 +14,9 @@ header! {
     #[doc="```plain"]
     #[doc="If-Unmodified-Since = HTTP-date"]
     #[doc="```"]
+    #[doc=""]
+    #[doc="# Example values"]
+    #[doc="* `Sat, 29 Oct 1994 19:43:31 GMT`"]
     (IfUnmodifiedSince, "If-Unmodified-Since") => [HttpDate]
 
     test_if_unmodified_since {