diff --git a/docs/generators/java.md b/docs/generators/java.md
index 0cb76c15409..8b360b4b427 100644
--- a/docs/generators/java.md
+++ b/docs/generators/java.md
@@ -19,6 +19,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |bigDecimalAsString|Treat BigDecimal values as Strings to avoid precision loss.| |false|
 |booleanGetterPrefix|Set booleanGetterPrefix| |get|
 |caseInsensitiveResponseHeaders|Make API response's headers case-insensitive. Available on okhttp-gson, jersey2 libraries| |false|
+|configKey|Config key in @RegisterRestClient. Default to none. Only `microprofile` supports this option.| |null|
 |dateLibrary|Option. Date library to use|<dl><dt>**joda**</dt><dd>Joda (for legacy app only)</dd><dt>**legacy**</dt><dd>Legacy java.util.Date (if you really have a good reason not to use threetenbp</dd><dt>**java8-localdatetime**</dt><dd>Java 8 using LocalDateTime (for legacy app only)</dd><dt>**java8**</dt><dd>Java 8 native JSR310 (preferred for jdk 1.8+) - note: this also sets &quot;java8&quot; to true</dd><dt>**threetenbp**</dt><dd>Backport of JSR310 (preferred for jdk &lt; 1.8)</dd></dl>|threetenbp|
 |developerEmail|developer email in generated pom.xml| |team@openapitools.org|
 |developerName|developer name in generated pom.xml| |OpenAPI-Generator Contributors|
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
index 1d8b4f18ba2..1e2740f1858 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
@@ -56,7 +56,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String USE_PLAY_WS = "usePlayWS";
     public static final String PLAY_VERSION = "playVersion";
     public static final String ASYNC_NATIVE = "asyncNative";
-    public static final String CONFIGKEY = "configKey";
+    public static final String CONFIG_KEY = "configKey";
     public static final String PARCELABLE_MODEL = "parcelableModel";
     public static final String USE_RUNTIME_EXCEPTION = "useRuntimeException";
     public static final String USE_REFLECTION_EQUALS_HASHCODE = "useReflectionEqualsHashCode";
@@ -162,6 +162,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         cliOptions.add(CliOption.newBoolean(DYNAMIC_OPERATIONS, "Generate operations dynamically at runtime from an OAS", this.dynamicOperations));
         cliOptions.add(CliOption.newBoolean(SUPPORT_STREAMING, "Support streaming endpoint (beta)", this.supportStreaming));
         cliOptions.add(CliOption.newString(GRADLE_PROPERTIES, "Append additional Gradle proeprties to the gradle.properties file"));
+        cliOptions.add(CliOption.newString(CONFIG_KEY, "Config key in @RegisterRestClient. Default to none. Only `microprofile` supports this option."));
 
         supportedLibraries.put(JERSEY1, "HTTP client: Jersey client 1.19.x. JSON processing: Jackson 2.9.x. Enable gzip request encoding using '-DuseGzipFeature=true'. IMPORTANT NOTE: jersey 1.x is no longer actively maintained so please upgrade to 'jersey2' or other HTTP libraries instead.");
         supportedLibraries.put(JERSEY2, "HTTP client: Jersey client 2.25.1. JSON processing: Jackson 2.9.x");
@@ -283,8 +284,8 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         }
         additionalProperties.put(MICROPROFILE_FRAMEWORK, microprofileFramework);
 
-        if (additionalProperties.containsKey(CONFIGKEY)) {
-            this.setConfigKey(additionalProperties.get(CONFIGKEY).toString());
+        if (additionalProperties.containsKey(CONFIG_KEY)) {
+            this.setConfigKey(additionalProperties.get(CONFIG_KEY).toString());
         }
 
         if (additionalProperties.containsKey(ASYNC_NATIVE)) {