diff --git a/assets/css/file-type-icons.css b/assets/css/file-type-icons.css
index 1fd378d..7dd94fd 100644
--- a/assets/css/file-type-icons.css
+++ b/assets/css/file-type-icons.css
@@ -1,5 +1,5 @@
 /* Additional file types */
-.ext-c:before {background-position: -48px 0 !important;}
+.ext-c:before, .ext-h:before {background-position: -48px 0 !important;}
 .ext-cpp:before, .ext-ino:before {background-position: -64px 0 !important;}
 .ext-cs:before {background-position: -80px 0 !important;}
 .ext-coffee:before {background-position: -96px 0 !important;}
diff --git a/assets/js/icecoder.js b/assets/js/icecoder.js
index 8c5c04d..897f280 100644
--- a/assets/js/icecoder.js
+++ b/assets/js/icecoder.js
@@ -1526,6 +1526,7 @@ var ICEcoder = {
               : fileExt === "erl" ? "Erlang"
               : fileExt === "jl" ? "Julia"
               : fileExt === "c" ? "C"
+              : fileExt === "h" ? "C"
               : fileExt === "cpp" ? "C++"
               : fileExt === "ino" ? "C++"
               : fileExt === "cs" ? "C#"
diff --git a/assets/js/language-modes-partial.js b/assets/js/language-modes-partial.js
index 4fc4d0b..f6b3130 100644
--- a/assets/js/language-modes-partial.js
+++ b/assets/js/language-modes-partial.js
@@ -21,6 +21,7 @@ var mode =
   : fileExt == "java"   ? "text/x-java"
   : fileExt == "jl"     ? "text/x-julia"
   : fileExt == "c"      ? "text/x-csrc"
+  : fileExt == "h"      ? "text/x-csrc"
   : fileExt == "cpp"    ? "text/x-c++src"
   : fileExt == "ino"    ? "text/x-c++src"
   : fileExt == "cs"     ? "text/x-csharp"
diff --git a/lib/indexer.php b/lib/indexer.php
index 5241250..12a589d 100644
--- a/lib/indexer.php
+++ b/lib/indexer.php
@@ -3,7 +3,7 @@ include "headers.php";
 include "settings.php";
 
 // File extensions to look for functions & classes in
-$indexableFileExts = ["php", "js", "coffee", "ts", "rb", "py", "mpy", "sql", "erl", "java", "jl", "c", "cpp", "ino", "cs", "go", "lua", "pl"];
+$indexableFileExts = ["php", "js", "coffee", "ts", "rb", "py", "mpy", "sql", "erl", "java", "jl", "c", "h", "cpp", "ino", "cs", "go", "lua", "pl"];
 
 // Fallback for prevIndexData to start off initially
 $prevIndexData = [];
@@ -91,7 +91,7 @@ function phpGrep($path, $base) {
                         (($filePathExt === "py" || $filePathExt === "mpy" || $filePathExt === "rb") && strpos($line, "def") !== false && strpos($line, "def") < strpos($line, "(")) ||
                         (($filePathExt === "js" || $filePathExt === "ts") && strpos($line, "=>") !== false) ||
                         (($filePathExt === "erl" || $filePathExt === "coffee") && strpos($line, "->") !== false) ||
-                        (($filePathExt === "c" || $filePathExt === "cpp") && strpos($line, "{") !== false && strpos($line, "{") > strpos($line, "(")) ||
+                        (($filePathExt === "c" || $filePathExt === "h" || $filePathExt === "cpp" || $filePathExt === "ino") && strpos($line, "{") !== false && strpos($line, "{") > strpos($line, "(")) ||
                         ($filePathExt === "go" && strpos($line, "func") !== false && strpos($line, "func") < strpos($line, "(")) ||
                         // ...or if the line contains "function" before opening parens...
                         (strpos($line, "function") !== false && strpos($line, "function") < strpos($line, "("))