diff --git a/README.md b/README.md
index b40fb68..2eaa613 100644
--- a/README.md
+++ b/README.md
@@ -15,9 +15,13 @@ Run Configuration support:
 * Java Run Configurations (IDEA)
 * Go Run Configurations (GoLand)
 
+[GitHub](https://github.com/BredoGen/ProjectEnv)
+
 ## Settings
 <kbd>Env Files</kbd> tool window > <kbd>Add your .env/json/yaml files</kbd>
 
+For JSON/Yaml files only String:String maps are currently supported.
+
 You can also toggle plugin features: <kbd>Env Files</kbd> tool window > <kbd>⚙️</kbd>:
 * Enable in Terminal (requires terminal restart)
 * Enable in Run Configurations
diff --git a/src/main/kotlin/com/bredogen/projectenv/providers/files/YamlFileProvider.kt b/src/main/kotlin/com/bredogen/projectenv/providers/files/YamlFileProvider.kt
index 45f9845..c9620f2 100644
--- a/src/main/kotlin/com/bredogen/projectenv/providers/files/YamlFileProvider.kt
+++ b/src/main/kotlin/com/bredogen/projectenv/providers/files/YamlFileProvider.kt
@@ -28,11 +28,12 @@ class YamlFileProvider(private val params : Map<String, String>) : EnvFileProvid
             result = Yaml().load(Files.readString(Paths.get(path)))
         } catch (ex: IOException) {
             throw EnvSourceException(ex)
+        } catch (ex: java.lang.ClassCastException) {
+            throw EnvSourceException("File content is not String:String map")
         }
         if (result == null) {
             throw EnvSourceException("Cannot process file. Malformed format?")
         }
-
         return result
     }
 }
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