diff --git a/rc/filetype/java.kak b/rc/filetype/java.kak
index 7fe91bbc..1c187fc5 100644
--- a/rc/filetype/java.kak
+++ b/rc/filetype/java.kak
@@ -28,6 +28,7 @@ provide-module java %§
 add-highlighter shared/java regions
 add-highlighter shared/java/code default-region group
 add-highlighter shared/java/string region %{(?<!')"} %{(?<!\\)(\\\\)*"} fill string
+add-highlighter shared/java/character region %{'} %{(?<!\\)'} fill value
 add-highlighter shared/java/comment region /\* \*/ fill comment
 add-highlighter shared/java/inline_documentation region /// $ fill documentation
 add-highlighter shared/java/line_comment region // $ fill comment
diff --git a/rc/filetype/kotlin.kak b/rc/filetype/kotlin.kak
index b51ef06a..76d3b7dd 100644
--- a/rc/filetype/kotlin.kak
+++ b/rc/filetype/kotlin.kak
@@ -55,7 +55,8 @@ provide-module kotlin %§
 
 add-highlighter shared/kotlin regions
 add-highlighter shared/kotlin/code default-region group
-add-highlighter shared/kotlin/string region %{(?<!')"} %{(?<!\\)(\\\\)*"} fill string
+add-highlighter shared/kotlin/string region %{(?<!')"} %{(?<!\\)(\\\\)*"} group
+add-highlighter shared/kotlin/character region %{'} %{(?<!\\)'} fill value
 add-highlighter shared/kotlin/comment region /\* \*/ fill comment
 add-highlighter shared/kotlin/inline_documentation region /// $ fill documentation
 add-highlighter shared/kotlin/line_comment region // $ fill comment
@@ -64,6 +65,10 @@ add-highlighter shared/kotlin/code/annotations regex @\w+\b|\b\w+@(?=\{) 0:meta
 add-highlighter shared/kotlin/code/identifiers regex \b(field|it)\b 1:variable
 add-highlighter shared/kotlin/code/fields      regex \.([A-Za-z_][\w]*)\s*?\. 1:type
 
+# String interpolation
+add-highlighter shared/kotlin/string/ fill string
+add-highlighter shared/kotlin/string/ regex \$\{.*?\} 0:value
+
 # As at 15 March 2021, method see: https://regex101.com/r/Mhy4HG/1
 add-highlighter shared/kotlin/code/methods     regex ::([A-Za-z_][\w]*)|\.([A-Za-z_][\w]*)\s*?[\(\{]|\.([A-Za-z_][\w]*)[\s\)\}>](?=[^\(\{]) 1:function 2:function 3:function