diff --git a/source/bubel/ecs/manager.d b/source/bubel/ecs/manager.d
index c1eb62a..15d1f6e 100644
--- a/source/bubel/ecs/manager.d
+++ b/source/bubel/ecs/manager.d
@@ -104,8 +104,8 @@ export struct EntityManager
                     Mallocator.dispose(system.jobs);
                 if (system.m_read_only_components)
                     Mallocator.dispose(system.m_read_only_components);
-                if (system.m_modified_components)
-                    Mallocator.dispose(system.m_modified_components);
+                if (system.m_writable_components)
+                    Mallocator.dispose(system.m_writable_components);
                 if (system.m_components)
                     Mallocator.dispose(system.m_components);
                 if (system.m_excluded_components)
@@ -656,7 +656,7 @@ export struct EntityManager
             size_t opt = components_info.optional.length;
             size_t excluded = components_info.excluded.length;
             size_t read_only = components_info.readonly.length;
-            size_t modified = components_info.mutable.length;
+            size_t writable = components_info.mutable.length;
             size_t read_only_deps = components_info.readonlyDeps.length;
             size_t writable_deps = components_info.writableDeps.length;
 
@@ -668,8 +668,8 @@ export struct EntityManager
                 system.m_excluded_components = Mallocator.makeArray!ushort(excluded);
             if (read_only > 0)
                 system.m_read_only_components = Mallocator.makeArray!ushort(read_only);
-            if (modified > 0)
-                system.m_modified_components = Mallocator.makeArray!ushort(modified);
+            if (writable > 0)
+                system.m_writable_components = Mallocator.makeArray!ushort(writable);
             if (read_only_deps > 0)
                 system.m_readonly_dependencies = Mallocator.makeArray!ushort(read_only_deps);
             if (writable_deps > 0)
@@ -870,7 +870,7 @@ export struct EntityManager
                 else
                     assert(comp != ushort.max, "Can't register system \"" ~ Sys.stringof
                             ~ "\" due to non existing component \"" ~ comp_info.type ~ "\".");
-                system.m_modified_components[iii] = comp;
+                system.m_writable_components[iii] = comp;
             }
         }
 
@@ -2954,7 +2954,7 @@ export struct EntityManager
                     ///check for component dependencies
                     foreach (cmp; caller.system.m_read_only_components)
                     {
-                        foreach (cmp2; caller2.system.m_modified_components)
+                        foreach (cmp2; caller2.system.m_writable_components)
                         {
                             if (cmp == cmp2)
                             {
@@ -2963,7 +2963,7 @@ export struct EntityManager
                             }
                         }
                     }
-                    foreach (cmp; caller.system.m_modified_components)
+                    foreach (cmp; caller.system.m_writable_components)
                     {
                         foreach (cmp2; caller2.system.m_read_only_components)
                         {
@@ -2973,7 +2973,7 @@ export struct EntityManager
                                 continue out_for;
                             }
                         }
-                        foreach (cmp2; caller2.system.m_modified_components)
+                        foreach (cmp2; caller2.system.m_writable_components)
                         {
                             if (cmp == cmp2)
                             {
diff --git a/source/bubel/ecs/system.d b/source/bubel/ecs/system.d
index 5bf750b..7bcaf01 100644
--- a/source/bubel/ecs/system.d
+++ b/source/bubel/ecs/system.d
@@ -127,7 +127,7 @@ package:
 
     //System*[] m_dependencies;
     ushort[] m_read_only_components;
-    ushort[] m_modified_components;
+    ushort[] m_writable_components;
 
     ushort[] m_readonly_dependencies;
     ushort[] m_writable_dependencies;