diff --git a/src/main/java/ua/net/uid/utils/Function.java b/src/main/java/ua/net/uid/utils/Function.java
index a3efb5a..d759e59 100644
--- a/src/main/java/ua/net/uid/utils/Function.java
+++ b/src/main/java/ua/net/uid/utils/Function.java
@@ -20,8 +20,9 @@
  * @author nightfall
  * @param <T> argument type
  * @param <R> result type
+ * @param <E> exception type
  */
 @FunctionalInterface
-public interface Function<T, R> {
-    R call(T param) throws Exception;
+public interface Function<T, R, E extends Throwable> {
+    R call(T param) throws E;
 }
diff --git a/src/main/java/ua/net/uid/utils/Procedure.java b/src/main/java/ua/net/uid/utils/Procedure.java
index 4752c9e..90ea34f 100644
--- a/src/main/java/ua/net/uid/utils/Procedure.java
+++ b/src/main/java/ua/net/uid/utils/Procedure.java
@@ -19,8 +19,9 @@
  *
  * @author nightfall
  * @param <T> argument type
+ * @param <E> exception type
  */
 @FunctionalInterface
-public interface Procedure<T> {
-    void call(T param) throws Exception;
+public interface Procedure<T, E extends Throwable> {
+    void call(T param) throws E;
 }